Crystal detector



Feb. 3, 1925. 1,525,159

H M. WOHLTMAN ET AL CRYSTAL DETECTOR Filed April 24, 1922 W gwywzPatented Feb. 3, 1925.

PATENT OFFICE.

HENRY M. W'OI-ILTMAN AND MAX HIBSCHFELI), OF BROOKLYN, NEW YORK.

CRYSTAL DETECTOR.

Application filed April 24, 1922. Serial No. 556,214.

T 0 all whom it may concern:

Be it known that we, HENRY M. lVoHLT- MAN andl/Lix Hmsorrrnnn, citizensof the United States, residing at, respectively, Brooklyn, county ofKings, city of New York, and State of New York, and Broolc lyn, countyof Kings, city of New York, and State of New York, have invented new anduseful Improvements in Crystal Detectors, of which the following is afull, clear, and exact specification.

Our invention relates to wireless wave detecting devices and refersparticularly to crystal detectors.

The object of our invention is a wireless wave detecting deviceemploying a crystal, in which all parts are easily accessible andreplaceable, in which the entire surface of the crystal may be utilizedand which is capable of the most delicate adjustment.

Devices of this character are usually produced by setting, or fixing,the crystal within a cup, or container, whereby only a portion ofthecrysta-l surface is exposed for purposes of wave detection. Thisparticular form of construction very considerably reduces the efliciencyand economy of these de tectors.

Another disadvantage of detectors of the above described construction isthe difiiculty experienced in replacing old crystals by new ones.

The device of our invention overcomes all of these and otherdifficulties and presents a means whereby the greatest efficiency andease of adaptability and replacement may be economically obtained.

In the accompanying drawings, illustrating one form of the device of ourinvention, similar parts are designated by similar numerals. I

Figure 1 is a top plan View of one form of a device or" our invention,

Figure 2 is a section through the line 2-2 of Figure 1. I

Figure 3 is a section through the line 33 of Figure 2, the spring andcrystal being removed.

The particular form of the device of our invention, shown in theaccompanying drawings, comprises an insulating base 10, to which areattached two oppositely opposed supporting members.

One supporting member comprises the angular plate 11 which is extendedoutward- 1y into the curved member 12 and the other supporting membercomprises the angular plate 11 which is extended into the curved member12.

Felt 13 separates the tube 14 from the plate 11 and felt 13 separatesthe tube 14 from the plate 11' and the two plates 11 and 11 are spacedfrom each other.

A glass tube 14 is connected to the plate 11 by the strap 15 and totheplate 11 by the strap 15, the tube 14 having a large bore 16 connectingwith a smaller bore 17 It has also a lug 4O placeable within a recess 41of the plate 11 to prevent it from rotat- A threaded rod 18 mesheswithin the threaded opening 19 of the supporting member 12, the inwardextension of the rod. 18 being smooth and reduced in diameter 20 andcarrying a cup 21 at its inner extremity and a knob 22 at its outerextremity.

A. threaded rod 23 meshes within the threaded opening 24 of thesupporting member 12 and is extended inwardly into a small diameter rod25, to which is fixedly attached a thin flexible. wire 26. A knob 27 iscarried by the rod 23.

Within the larger bore 16 of the tubes 14 is a spiral spring 28 abutableupon the cup 21 and the crystal 29.

Carried by the plates 11 and 11, respectively, are the binding posts 30and 30 and the binding screws 31 and 31.

A screw 42 passes through the insulating material 10, a plate 11 or 11,the felt 13 or 13 into a threaded recess within a binding post 30 or 30,thus combining the various elements.

The operation of the device is as follows The rod 18 is removed, thecrystal 29 is placed in the bore 16 of the glass tube 14, the spiralspring 28 inserted and the rod 18 screwed inwardly until the crystal 21is firmly placed in the shoulder of the tube 14 caused by the reductionof the large bore 16. The wire 26, which is not absolutely straight ismoved inwardly and outwardly, at the same time having a revolvingmovement by means of the rod 23 and thusmoved until the proper contactbetween the crystal 29 and the wire 26 is obtained.

If the crystal 29 does not present a sensitive point, or portion, therod 18 is withdrawn slightly, thus removing the crystal 110 29 fromfixed contact with the tube 14, and a slight movement given to thedevice will cause a change of position of the crystal which can thenebeset in fixed-position and the wire 26 be employed as before.

It is evident that by the above described means, all parts of thecrystal 29 may be easily and readily exposed to the wire 26, thusincreasing the usefulness of the crystal over those which are fixedlyenclosed in a cup, whereby only a portion of the crystal is exposed.

It is further evident that a new crystal may be readily introduced bysimply removing the rod 18, the spring 28 and the old crystal 29. 7

We do not limit ourselves to the particular size, shape, number,materials or arrangement of parts, as shown and described all of whichare given simply as a means for clearly describing our invention.

lVhat we claim is:

1. In a wave detecting device, in combination, an insulating base, twospaced supports carried by the base, a glass tube having a large bore inone portion thereof and a smaller bore in the other portion thereof, acrystal within the larger bore, resilient means maintaining the crystalacross the opening between the larger bore and the smaller bore, acrystal means whereby a Wire maybe brought into contact with differentfacial points of the crystal and binding posts and screws carried byeach support.

2. In a wave detecting device, in combination, an insulating base, twospaced sup ports carried by the base, a glass tube having a large borein one portion, thereof and a smaller bore in the other portion thereof,re silient means carried by one support whereby an uncovered crystal maybe maintained within the large. bore, an uncovered crystal and meanscarried by the other support whereby a wire can be brought into contactwith the crystal face, q 7

In a wave detecting device, in combination, an insulating base, twospaced supports carried by the base, a glass tube having a large bore inone portion thereof and a smaller bore in the other portion thereof,threaded means carried by the supportfmovable within the large bore, an.uncovered crystal within the large bore, a spiral spring between thethreaded member and the crys tal, a wire and a threaded member carriedby the other supportlwhereby the wire may be moved within .the with thecrystal.

4. In a wave detecting device, in combi nation, an insulating base, twospaced sup ports carried by the base, a glass tube hav ing a large. borein one portionthereofand a smaller bore in the other portion thereof,threaded means carried by one support movable within the, large bore, anuncovered crystal within the large bore, aspiral spring "etween thethreaded memberandthecrystal, a bent w re, a threaded member carried bythe other support wherebythebent wire may be moved transversely through'and revolubly within the small bore to contact with the crystal and abinding post and screw carried by each supportin Signed at New Yorkcity, in the county of New York and State of New York, this 15th day ofApril, 1922.

HENRY M. wonr'ri in. MAX nres cnrnnnu small bore to contact.

member.

